Update Kyber

tools/kyberdecap.c

@@ -0,0 +1,171 @@
+/*
+ *  Copyright 2014-2025 The GmSSL Project. All Rights Reserved.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the License); you may
+ *  not use this file except in compliance with the License.
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ */
+
+
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+#include <gmssl/mem.h>
+#include <gmssl/error.h>
+#include <gmssl/kyber.h>
+
+
+static const char *usage = "-key file [-in file] [-out file] [-verbose]\n";
+
+static const char *options =
+"Options\n"
+"    -key file                   Input private key file\n"
+"    -in file                    Input ciphertext (encapsulated secret)\n"
+"    -out file                   Output decapsulated secret\n"
+"    -verbose                    Print public key and ciphertext\n"
+"\n";
+
+int kyberdecap_main(int argc, char **argv)
+{
+	int ret = 1;
+	char *prog = argv[0];
+	char *keyfile = NULL;
+	char *infile = NULL;
+	char *outfile = NULL;
+	int verbose = 0;
+	FILE *keyfp = NULL;
+	FILE *infp = stdin;
+	FILE *outfp = stdout;
+	uint8_t keybuf[KYBER_PRIVATE_KEY_SIZE];
+	size_t keylen = KYBER_PRIVATE_KEY_SIZE;
+	const uint8_t *cp = keybuf;
+	uint8_t *p = keybuf;
+	KYBER_PRIVATE_KEY key;
+
+	uint8_t inbuf[sizeof(KYBER_CIPHERTEXT)];
+	uint8_t outbuf[32];
+
+	KYBER_CIPHERTEXT ciphertext;
+
+	memset(&key, 0, sizeof(key));
+
+	argc--;
+	argv++;
+
+	if (argc < 1) {
+		fprintf(stderr, "usage: gmssl %s %s\n", prog, usage);
+		return 1;
+	}
+
+	while (argc > 0) {
+		if (!strcmp(*argv, "-help")) {
+			printf("usage: %s %s\n", prog, usage);
+			printf("%s\n", options);
+			ret = 0;
+			goto end;
+		} else if (!strcmp(*argv, "-key")) {
+			if (--argc < 1) goto bad;
+			keyfile = *(++argv);
+			if (!(keyfp = fopen(keyfile, "rb+"))) {
+				fprintf(stderr, "%s: open '%s' failure: %s\n", prog, keyfile, strerror(errno));
+				goto end;
+			}
+		} else if (!strcmp(*argv, "-in")) {
+			if (--argc < 1) goto bad;
+			infile = *(++argv);
+			if (!(infp = fopen(infile, "rb"))) {
+				fprintf(stderr, "%s: open '%s' failure: %s\n", prog, infile, strerror(errno));
+				goto end;
+			}
+		} else if (!strcmp(*argv, "-out")) {
+			if (--argc < 1) goto bad;
+			outfile = *(++argv);
+			if (!(outfp = fopen(outfile, "wb"))) {
+				fprintf(stderr, "%s: open '%s' failure: %s\n", prog, outfile, strerror(errno));
+				goto end;
+			}
+		} else if (!strcmp(*argv, "-verbose")) {
+			verbose = 1;
+		} else {
+			fprintf(stderr, "%s: illegal option '%s'\n", prog, *argv);
+			goto end;
+bad:
+			fprintf(stderr, "%s: `%s` option value missing\n", prog, *argv);
+			goto end;
+		}
+
+		argc--;
+		argv++;
+	}
+
+	if (!keyfile) {
+		fprintf(stderr, "%s: `-key` option required\n", prog);
+		goto end;
+	}
+
+	if (fread(keybuf, 1, keylen, keyfp) != keylen) {
+		fprintf(stderr, "%s: read private key failure\n", prog);
+		goto end;
+	}
+	if (kyber_private_key_from_bytes(&key, &cp, &keylen) != 1) {
+		error_print();
+		goto end;
+	}
+	if (keylen) {
+		error_print();
+		return -1;
+	}
+
+	if (verbose) {
+		kyber_private_key_print(stderr, 0, 0, "kyber_private_key", &key);
+	}
+
+
+	size_t inlen = sizeof(inbuf);
+
+	if (fread(inbuf, 1, inlen, infp) != inlen) {
+		fprintf(stderr, "%s: read ciphertext failure\n", prog);
+		goto end;
+	}
+	cp = inbuf;
+	if (kyber_ciphertext_from_bytes(&ciphertext, &cp, &inlen) != 1) {
+		error_print();
+		goto end;
+	}
+	if (inlen) {
+		error_print();
+		return -1;
+	}
+
+
+	if (verbose) {
+		kyber_ciphertext_print(stderr, 0, 0, "kyber_ciphertext" ,&ciphertext);
+	}
+
+
+
+	if (kyber_decap(&key, &ciphertext, outbuf) != 1) {
+		error_print();
+		return -1;
+	}
+
+
+	if (verbose) {
+		format_bytes(stderr, 0, 0, "key", outbuf, 32);
+
+
+	}
+
+
+	ret = 0;
+
+end:
+	//kyber_key_cleanup(&key);
+	gmssl_secure_clear(keybuf, sizeof(keybuf));
+	if (keyfp) fclose(keyfp);
+	if (infp && infp != stdin) fclose(infp);
+	if (outfp && outfp != stdout) fclose(outfp);
+	return ret;
+}